Nitric oxide, also known as NO or NO2, is the body's primary vasodilator, relaxing and opening blood vessels within muscles to enhance blood flow. Nitric oxide can help deliver more nutrients and oxygen to muscle while removing more metabolic waste.* Bodybuilders often use nitric oxide as part of a complete nutritional regimen that includes protein powder and creatine.

The nitric oxide boosters in this section incorporate known precursors like arginine, citrulline and L-norvaline. Many are available in powder form to add to water, while others come in convenient tablet form.

Nitric oxide, a naturally occurring substance in your body, plays a role in aerobic capacity, exercise performance and cardiovascular health. We prime the nitric oxide pathway with the amino acids L-Citrulline and L-Arginine, which are more effective when used together. The formula also includes Spectra™, a precise blend of 29 fruit, vegetable and herbal ingredients. Spectra™ was shown in a clinical trial to help support nitric oxide levels and antioxidant activity in humans at a dose of 100 mg.* Take 4 capsules with a large glass of water 1-2 times daily. Take before workouts or between meals.

*Disclaimer: These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. Product results may vary from person to person.

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